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Carbon dioxide reforming of methane to synthesis gas over Ni-MCM-41 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43121 45956 2009 9 PDF Available
Title
Carbon dioxide reforming of methane to synthesis gas over Ni-MCM-41 catalysts
Abstract

A series of nickel incorporated MCM-41 mesoporous molecular sieves (Ni-MCM-41) were prepared by direct hydrothermal synthesis. Nickel nitrate was used as the Ni precursor. The catalytic properties of the Ni-MCM-41 were studied for the reforming of methane with carbon dioxide. The catalysts were carefully characterized by X-ray diffraction (XRD), N2 physisorption, H2 temperature-programmed reduction (TPR), H2 chemisorption, thermogravimetry, and Raman spectra. The results indicated that the presence of a suitable amount of nickel in Ni-MCM-41 was beneficial for maintaining high catalytic activity and long-term stability. The improved catalytic performance was suggested to closely associate with both the amount of active centers on the pore wall surface and the stabilized dispersion of these active sites by the silica matrix and/or the surrounding unreduced nickel ions. This anchoring effect facilitated the formation of the active Ni nano-clusters with high dispersion under reaction conditions. Hence the reforming reaction is favored and the carbon formation is suppressed. Two types of carbon species: active carbon and graphite were produced over the spent catalysts. The Ni-MCM-41 catalysts provided good catalytic activity, high stability and reasonable CO/H2 ratios in the product. Thus, the Ni-MCM-41 catalyst prepared by the direct hydrothermal synthesis promised a novel and stable catalyst candidate for CO2 reforming of CH4.

Graphical abstractHighly ordered Ni-MCM-41 catalysts were prepared by a direct hydrothermal synthesis, and the catalytic properties were studied for the reforming of methane with carbon dioxide. The results indicated that Ni-MCM-41 catalyst by direct incorporation method shows superior catalytic stability compared to impregnated samples. The improved catalytic performance closely associated with the anchoring effect.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ni-MCM-41; Methane; Carbon dioxide; Reforming; Anchoring effect; Stability
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Carbon dioxide reforming of methane to synthesis gas over Ni-MCM-41 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 358, Issue 2, 1 May 2009, Pages 110–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us